Optimal scheduling of block lifting in consideration of the minimization of traveling distance while unloaded and wire and shackle replacement of a gantry crane |
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Authors: | Myung-Il Roh Kyu-Yeul Lee |
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Institution: | (1) School of Naval Architecture and Ocean Engineering, University of Ulsan, Daehak-Ro 102, Nam-Gu, Ulsan, 680-749, Korea;(2) Department of Naval Architecture and Ocean Engineering, Research Institute of Marine Systems Engineering, Seoul National University, Shinlim-Dong, Seoul, 151-742, Korea |
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Abstract: | Nowadays, shipyards are making every effort to efficiently manage their resources such as gantry cranes, transporters, and
block stock yards. The scheduling of block lifting for a gantry crane has been manually performed by an expert shipyard manager
for many years. Such a practice, however, can lead to an undesirably long time to produce scheduling plans. In addition, the
quality of the scheduling plans may not be optimal. To improve the overall process, a block lifting scheduling system for
a gantry crane was developed in this study by using optimization techniques. A block lifting scheduling problem was first
formulated as a multiobjective optimization problem. For a gantry crane, minimization of the traveling distance while unloaded
and wire and shackle replacement between block lifting was considered. An optimization algorithm based on the genetic algorithm
was then proposed and implemented so as to solve the problem. To evaluate the efficiency and applicability of the developed
system, the system was applied to an actual block lifting scheduling problem in a shipyard. Compared to results achieved by
manual scheduling by an expert manager, the results of this work show that blocks can be more efficiently lifted by a gantry
crane when the developed system is applied. |
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